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A system to detect the terahertz (THz) pulse signals has been studied based on the superconducting NbN hot electron bolometer (HEB) detectors, which has the noise equivalent power (NEP) of 9×10−12 W/√Hz, together with a Fourier transform spectrometer (FTS). The detector has been driven by an easily adjustable microwave source to its best bias working point, and its output shown a linear relationship...
Intermediate frequency (IF) gain bandwidth (GBW) of terahertz (THz) mixers based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) has been improved. The IF GBW has been measured by 2 different methods and same values up to 7 GHz have been obtained.
Using a double-sided fabrication method, we fabricated Bi2Sr2CaCu2O8 (BSCCO) intrinsic Josephson junctions (IJJs) with a gold-BSCCO-gold structure. Coherent emission is observed at large dc input power, where a hot spot and “cold” part of the stack, coexist. The power, directly detected with a bolometer, is as high as 25 µW, implying the integrated power should be already in the order of sub-mW. We...
Superconducting receivers based on large hot electron bolometer (HEB) bridges were constructed and they show low noise temperatures. Their stability has been characterized by the Allan variance measurements with either far-infrared laser or Gunn oscillator plus multiplier chain as the local oscillator. An Allan time of about 1 s has been obtained. Also demonstrated is the effectiveness of a stabilization...
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